Update _includes/links.md

Co-authored-by: Rémi Kazeroni <[email protected]>

Author: mo-tgeddes

_includes/links.md

@@ -44,7 +44,7 @@
 [provenance]: https://docs.esmvaltool.org/en/latest/community/diagnostic.html?highlight=provenance#recording-provenance
 [python-gapminder]: https://swcarpentry.github.io/python-novice-gapminder/
 [pyyaml]: https://pypi.python.org/pypi/PyYAML
-[recipe]: https://github.com/ESMValGroup/ESMValTool/blob/master/esmvaltool/recipes/examples/recipe_python.yml
+[recipe]: https://github.com/ESMValGroup/ESMValTool/blob/main/esmvaltool/recipes/examples/recipe_python.yml
 [r-markdown]: https://rmarkdown.rstudio.com/
 [rstudio]: https://www.rstudio.com/
 [ruby-install-guide]: https://www.ruby-lang.org/en/downloads/